Slide-rule.



A. W. KELLY 8L1. HORNYAK-.

SLIDE RULE.

APPLICATION FILED NOV. T, I9I3.

Patented J an. 2, 1917.

2 SHEETS-SHEET l.

-DIIIII A. w. KELLY & I. HORNYAK.

SLIDE RULE.

' APPLICATION FILED "UV. 7. 1913- Patented Jan. 2, 1917.

' improvements in 10 to provide 2 fixed UNITED STATES PATEN T 2 OFFICE.

mm W. AND JOHN ROMA K, OI PENNSYLVANIA.

suns-am v 1,210,488. Specification of Letter! lltent Patented Jan. 2, 1917. mime filed Imam 7, 1m. 5611.180. 10am. To all'whom itmay concern: trated in Figs. 1 to 3 inclusive2 represents Be it known that we, Amnmw W. KELLY Hosmmx, resid' at Philadelhia, in the county of Philadelphia and tate of Pennsylvania, and useful Improvements in Slide-Rules, of which the followingis a specification.

Our invention relates to new and useful and JOHN its object to provide and efiective device of by the weight of any object-which increases its weight uniformly may be obtained when given the measurements of the object.

Another object of vide means for finding the time consumed inmaking a cut in a lathe or the solution of other equations, and any desired constant may be placed upon the slides and certain ones'adde'd, especially those which are used for the articular work of the operator or owner 0 the rule. r

A still further object of the invention is scales with which co-act one of which is provided with 2 this character, whereides,

scales on'each side, another with certain constants on both sides relat' to difierent forms of cross sections, a s we as those relating to distance, etc.

With these ends m view, this invention consists in the details .combination of elements hereinafter set forthand then specifically by the verse facd" view the claims.

In order that those skilled in the art to which this invention apxertains mayunderstand how to'make an use the same, we

ferring by numeral to the drawing forming a part of will describe its construc'tion in. detail, re-

the W tion, in which v Figure 1 is a' plane or face-view ofmy1mproved sli e rule, showing the slides sition for finding the weight of any regul ar object, the material and dimensions of which are. known. 2, is a back or review thereof. Fig. 4, is a face view thereof showing the slides reversed'and'in the position for the first operation of obtaining the time for making a cut in a lathe; and Fig. 5, is a similar view showing theshdes in the last position when solving the problem referredtoinFig.4. In carrying put our invention as illushave' invented new slide rules, and has for an exceedingly simple the invention is to proand are laid out of construction and ience of explanation. 10 represents the weightof the mass or ob- Fig. 3, is an' end of steel 3 inches to the.

the frame or body of the rule gitudinal recess 3 in one of which are fitted to slide the slides 4 and 5, being held in place by tongues 6 which register with the v ves 7.

In order that the slides 4 readily 0 rated, a'notch or tion 8 is ormed in the back each end.

On the front face of the body are provided two fixed logarithmic scales9 and 10 intermediate of which are mounted the slides 4 and 5. The slide '4; has marked 'on one face two lo'garithmic'scales 11 and 12, so that we have on the scales 9, 11 and 12 the three dimensions of a mass or object, the scale 9 representing the thickness, the scale 11 the width, and, the scale 12 thelength. The slide 5 has a number of constants re resented upon one face and designated l y the numerals 1'3 and 14. The constants 13 denote the kind of material in the mass according to the specific gravity of the mass. Said constants are situated upon one edge of the slide, while aving a Ion its faces, in

and 5 may be gateway poro the other constants 14 are situated upon the opposite edge and represent the shape of the mass or object in cross section. Of course it is to be understood that any number of constants may be used, only a; small nlgmber being here represented for conven- The other fixed scale ject in pounds In order to find the wei ht of a 'ven object,. the slide 4 is move until t e figure the scale 11 representing the width of "the object is brought opposite to the figure 95 1 u on the scale 9 representing the thickness, a r which the slide 5 is moved until the point designating the kind of material from which the object is made registers with a figure upon the scale '12. which represents the length of the obiect and when the slides are in the desired osition the weight in pounds will be found weight being re resented by the figure upon said scale 10, w ich the constant 14 representing the cross section or shape of the ob'ect.

In practice to find t 8 feet long, the slides a and 5 aremoved positions shown in Fig. 1, at which the body at.

is in registration withupon the scalelO, said T v e weight of a pie thick, i of an inch wide and 'ing that said object which terminate at time the numeral 4 on the scale 11 registers with the numeral 3 on the scale 9, and the constant steel registers with the numeral 8 on the scale 12 representing feet, thus giving the weight of the object upon the scale vided with certain constants which difier' from the ones uponits front face, and these constants are adjacent one edge only, and said reverse face of the slide is further providedwith a Z line 17 the ends of slide 5.

r In Figs, 4 and 5 we have positions illustrated the scale registers with a numeral on the scale 9 and the top of the Z line registers with a numeral on the scale 16, the bottom of the Z line" will register with the prod uct of the numbers. In practice to solve N the equation 10X16 40 12618= -167 5+, the

scale 15 is moved until the numeral 16 there-- on registers with the numeral {10 on the scale 9, and the top of the Z line-on the slide 5 registers with the numeral on the scale 16;

-, then the numeral upon the scale 10in registration with the constant .2618 on the bot-- tom edge of the slide 5 is the product-erresult which in; thiscase is 1675+, as shown in Fig. 4.

In Fig. 5 is shown the result of dividing the above product by 30 or solving the equation Proceed as above until the product of 10 l6 40 2618 is reached. Then hold the slide 5 in this position and move the slide 4 until the numeral 30 on the scale 16 registers with the top of the Z line (this op-' eration not being shown). Afterthe parts are in this position, then hold the slide 4 stationary and move the slide 5 until the top of the Z line registers with thenumeral upon the scale 16. ihen by looking at the numeral on the scale 10 under the constant .2618 on the slide 5, the product or result may be ascertained, which in this case is 55+.

The different. slides may be provided with any'number of diderent constants and some opposite edges of the 1 of the slides. When the slides are" moved to such a position that a numeral on:

may be arranged on one face and some on the other face thereof as shown fortheslide 5 in Figs. 1 and 5, said slide as shown in Fig. 5 being reversed to the position shown in Fig. 1. The constants shown upon the difierent scales are not all used in any one equation, but certain of them are used at one time, and others at another time, and then again the constants on one face of one of the slides areused for solving one portion of an equation, and the constants on the other side aroused forsolving the balance of the equation.

An example of the use. of both sides of the slides 4 and 5 is :--find the price of ten bars of steel 3 inches thick, one quarter inch wide and 8 feet long at three cents per pound.

To solve the above example upon the slide rule, the slides 4 and 5 are moved to the positions shown in Fig. 1, at which time the numeral 4 on the scale-11 registers with the numeral 3 on the scale 9, and the constant steel registers" with the numeral 8' on the scale "12 representing feet, thus giving the weight'o'f the object upon the scale 10 opposite the'rectangular constant, showing that said-- "obj ect 1 will weigh approximately 20% pounds. After finding the wei bar .as above, the slides 4 and 5 are reversed and the slide 4 moved until the numeral 10 ght of one on the scale (15,. denoting the number of pieces, registers with the numeral or indication representing 20% pounds, or the weight of-on'e 'piece," 'on'th'e" scale 9, then the slide 5 is moved until'the upper end of the Z line registers with the numeral 3 on the scale 16, representing the price per pound, at which time theopposite'or lower end of the Z line registers; with the'numeral or indication for 6125 on the scale 10 which is the price in cents'for'the entire lot. This last operation is not shown on the drawings, but only denotes' a different position of the slides from that shown in'Figs, 4 and 5.

0f course wedo not wish to be limited to the exact" details of -construction as here shown as'these may be varied within the limits of the appended claims without de parting from the spirit of our invention.

Havingthu's fully described our invention, what we claim as new and useful, is-

1. Aslide rule comprising a body, a pair of slides mounted within said body, a scale on said body advancing toward the right, a similar scale advancing toward the left on one ofsaid slides, coacting with the first named scale, another scale on said slide, an-

other scale on the body, and a constant scale 1 on the other slide coacting with the last two named scales.

2. A slide rulecomprising a body, .a pair of slides mounted within said b'ody, a scale on said body advancing toward the right, a similar scale advancing toward the left on v one of said slides coacting with the first afiixed our signatures in the presence of two named scale, another scale on said slide, a subscribing witnesses. constant scale on the other slide, a Z line on ANDREW W. KELLY.

said other scale, and another scale on the JOHN HORNYAK. 5 body coacting. with the constant scale and Witnesses:

with one end of said Z line. JOSEPH SZAFKA,

In testimony whereof, we have hereunto R. RAYMOND PORTER. 

